Provided by: yagiuda_1.19-7_amd64 bug

NAME

       output - output data file formats

DESCRIPTION

       This  manual  page  describes  the  output  formats  of  the files created by the Yagi-Uda
       project's output program. The files are ASCII file, so can  be  analysed  with  any  graph
       plotting program.

Example of a .dat File

       Below  is  a  typical  .dat  file,  for  a 4ele 144-146MHz beam, optimised for a huge (and
       useless) FB.

       # Driven=1 parasitic=3 total-elements=4 design=145.000MHz
       # Checked from 144.000MHz to 146.000MHz.
       f(MHz) E(deg) H(deg) R       jX   VSWR  Gain(dBi)  FB(dB) SideLobes(dB)
       144.000 54.7  71.5  44.47  -2.35  1.136  9.386     21.944     16.650
       144.500 54.0  70.1  41.34  -0.75  1.210  9.553     27.244     17.153
       145.000 53.2  68.4  37.55   1.61  1.335  9.742    103.055     17.777
       145.500 52.3  66.6  33.26   5.00  1.530  9.947     25.734     18.547
       146.000 51.3  64.6  28.77   9.63  1.832 10.149     18.919     18.919

What is what in the .dat file

       The f(MHz) column is the frequency (MHz) at which the data is evaluated at.
       The E(deg) column is the approximate 3dB E-plane bandwidth calculated to the  nearest  0.1
       degree.
       The  H(deg)  column is the approximate 3dB H-plane bandwidth calculated to the nearest 0.1
       degree.
       The (R) column is the input resistance in Ohms.
       The (jX) column is the  input reactance in Ohms.
       The (VSWR) column is the input VSWR, usually refered to a 50 Ohm input, but  this  may  be
       changed.
       The  Gain  (dBi) column is the gain at theta=90 degrees, which is the forward direction of
       the beam. It is possible that a higher gain occurs at other than 90 degrees, but  this  is
       not taken into account. The antenna is seriously at fault if this occurs.
       The FB(dB) column is the front to back ratio in dB.
       The  Sidelobes(dB)  column  is  the  minimum  level  in  dB down from the peak gain of any
       sidelobe. This is not calculated unless the '-c' option is used, and  then  only  on  some
       optimisation techniques.

Example of a .gai File

       The following is a small section of the .gai file.
       f(MHz)     theta  gain-E(dBi) G(E)-peak   phi   gain-H(dBi) G(H)-peak
       144.0000 -90.0000  -12.5584   -21.9444 -180.0000 -12.5584  -21.9444
       144.0000 -45.0000   -7.3507   -16.7367 -135.0000  -3.5971  -12.9830
       144.0000   0.0000 -999.0000 -1008.3860  -90.0000  -0.9010  -10.2870
       144.0000  45.0000    0.1848    -9.2012  -45.0000   4.0261   -5.3599
       144.0000  90.0000    9.3860     0.0000    0.0000   9.3860    0.0000
       144.0000 135.0000    0.1848    -9.2012   45.0000   4.0261   -5.3599
       144.0000 180.0000 -999.0000 -1008.3860   90.0000  -0.9010  -10.2870
       144.0000 225.0000   -7.3507   -16.7367  135.0000  -3.5971  -12.9830
       144.0000 270.0000  -12.5584   -21.9444  180.0000 -12.5584  -21.9444

What is what in the .gai file

       The f(MHz) column is the frequency in MHz.
       The theta column is the angle theta, for which the next two columns refer.
       The  gain-E(dBi)  is the gain at theta, relative to an isotropic radiator.  This is the E-
       plane gain. Hence at the peak (theta), this gives the peak forward gain.
       The G(E)-peak is the gain at theta, relative to the peak gain. Hence at the peak (theta=90
       degrees), this is zero.
       The  phi  column  has nothing to do with the previous 3 columns. It is the angle for which
       the next two columns refer.
       The gain-H(dBi) is the gain at phi, relative to an isotropic radiator.   This  is  the  H-
       plane gain. Hence at the peak (phi=0), this gives the peak forward gain.
       The  G(H)-peak  is  the  gain  at phi, relative to the peak gain. Hence at the peak (phi=0
       degrees), this is zero.

Example of a .up File

       The .up file list the improvements made by optimise to an antenna  design.  Starting  from
       the  original design, the file is appended each time a new better design is found. Here is
       an example, where the final line is the performance of the 4ele beam with  the  .dat  file
       shown earlier.
           1 7.57dBi,  16.93dB F/B, Z=(31.77-56.34j) Ohms, VSWR=3.95, SL=16.95 dB
          84 7.58dBi,  16.93dB F/B, Z=(31.78-56.32j) Ohms, VSWR=3.95, SL=16.95 dB
         623 7.58dBi,  16.93dB F/B, Z=(31.78-56.28j) Ohms, VSWR=3.95, SL=16.95 dB
       89345 9.74dBi, 103.06dB F/B, Z=(37.55 +1.61j) Ohms, VSWR=1.33, SL=17.78 dB

What is what in the .up file

       The  first  column  is  an integer specifying the iteration. The other columns, going from
       left to right are gain(dBi), FB, input impedance, VSWR and level of the  most  significant
       sidelobe, in dB down on the peak gain.

SEE ALS0

       yagi(1), output(1), input(1), optimise(1), first(1) and yagi(5).

AUTHORS

       Dr.  David  Kirkby  G8WRB (david.kirkby@onetel.net), with help with converting to DOS from
       Dr. Joe Mack NA3T (mack@fcrfv2.ncifcrf.gov).